Qt数据库加载驱动并连接

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//头文件

#include <QSqlDatabase>#include <QSqlQuery>#include <QSqlError>#include <QSqlDriver>

//从ini文件中读取数据库相关ip、name

bool createConnection(){    QSqlDatabase db = QSqlDatabase::addDatabase("QPSQL");//添加数据库驱动    QSettings m_set(qApp->applicationDirPath() + "/config/" + "SPSDB.ini", QSettings::IniFormat);    QString ip = m_set.value("DBInfo/ip").toString();    QString dbname = m_set.value("DBInfo/dbname").toString();    QString dbuser = m_set.value("DBInfo/dbuser").toString();    QString dbpwd = m_set.value("DBInfo/dbpwd").toString();    db.setHostName(ip);    db.setDatabaseName(dbname);    db.setUserName(dbuser);    db.setPassword(dbpwd);    if (!db.open())    {        QMessageBox::critical(0, QObject::tr("Database Error"), db.lastError().text());        return false;    }    return true;}

//通常情况下，是在main函数中调用createConnection()的

int mian(int argc,char *argv[]){    QApplication app(argc,argv);    if(!createConnection())    {        return 1;    }    return app.exec();}

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